Question about 2001 Toyota Echo

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Engine light is on ,code P0171, hesitates when start driving

2001 Toyota echo. engine light is on.shows code P0171. replaced O2 sensor.Still light is on.Now when I stop on red light or stop sign,car hesitates to move for 5seconds when I'm pressing accelerator pedal and after that car drives,but for the first 5 or 10 seconds car moves like a turtle. Is it fuel pump or filter? Please help.

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  • henrikasr Jun 08, 2009

    light is off.fuel pump is changed over the weekend.spark plugs were changed last year.poured a bottle of injector cleaner.but still car does the same thing-hesitates to move and poor acceleration. would you please describe step by step what next needs to be done.check injection system? how? intake manifold gasket? I hope that's not transmission problem(btw-changed two years ago,drove over piece of ice and blew a gasket). Thanks for help.

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You will need a code reader to turn light off

Posted on Jun 02, 2009

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If you have had a bad enough problem with the fuel filter, and it is not the fuel pump I would have to say it is the injectors. If your car is fuel injected there could be dirt in the injectors in which case they will need to be replaced. The problem is you can flush the whole fuel system except for the fuel injectors themselves. Though I am not sure how to check them myself, a mechanic could tell you if this is the problem in minutes. I cant say for sure if this is your problem but I have a 79 corrolla and it is doing the same thing and since I have replaced almost the whole fuel line except for the injectors themselves this is what I am leaning towards. Good luck!

Posted on Jun 08, 2009

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Hi. These are symptoms that represents poor fuel distribution. i recommend changing both the filter and fuel pump in this case. I would also inspect the entire injection system for fouled wiring or damaged housing(injector housings).

IF the spark plugs haven't been inspected or changed in 9 months, i would pull them for a visual inspection as well. replace the wires and plugs if they are not in a proper condition.

Last, i would add a fuel system cleaner to scrub the fuel lines and rid the system of any carbon deposits that may be present in the intake manifold.

Check the Intake manifold gaskets for damage.

Posted on Jun 02, 2009

  • Michael Masters
    Michael Masters Jun 02, 2009

    Use the diagnostic Scan cpu to reset the ecm. this will shut off the light. if it illuminates once more after the reset, this will confirm a failed installation of the O2 sensor.

    It may also be another issue within the engine concerning another sensor o wiring harness malfunction.


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U dont need a reader to turn the check engine light off....all u do is disconnect the NEG side of the battery , leaving it off press and hold ur brake pedal for 10 seconds...this allows the code to reset.

Posted on Aug 16, 2009

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